Can't add accounts in Mail - stuck on "Next"

Update:

Apparently, I got back my 2nd mail. I made some experimenting on the keychain folder and drag every contents therein (including sub-folders) to the Desktop in case another thing failed.

After that, I restart my mac and go to Systems Pref > Internet Accounts without opening any apps. An iMessage window popped-up saying that I need to log-in my password, but I ignore that and drag the pop-up window aside.

Then I

add the problem email, input my password, select only mail (no other apps), and then, poof, it pass thru the “Next” Button Loop. I now have my 2nd email back in my mac native mail app.

It seems the problem is in the Keychain Folder itself when you are updating your OSX (mine is now Mojave).

Only thing is that I had to sign in again to my iMessage account since the whole keychain folder content is dragged out. But its ok for me since its working now.

I have the same issue with a pop account - just migrated to the new macbook air - and though my pop account was there - it wouldn't work - and when I try to delete it and re-add - I get in this same loop - was there any resolution to this?

I had the same issue. I deleted my Gmail account due to an error i was receiving. I tried adding the gmail account back to "Mac Mail" and once I got the the final step of "Done" it would not process to the next step of adding the account. I tried this method of "reseting the Default Keychain" and was able to add my gmail account to "Mac Mail" successfully. You will have to re-add your other mail passwords. But a very small price to pay for a solution. Give this a try if you are having the same or a similar issue. Thank you "ED in PA" for the solution.

Thank you! This has been driving me mad. This worked, though a bit of a palaver and I wasn't sure what you meant by 'conflicting status accounts' in keychain. I deleted a couple of likely suspects and bingo!

I did this and was asked to login to all my email accounts again. I now am asked to enter my email and click "Next", where I am stuck on the same pop up screen for ALL MY ACCOUNTS!!! I can't reach the password entry screen. I was denied access on one account and trying this solution I am now denied access to ALL. Extremely frustrated. I am left severely crippled in managing two businesses, that each use multiple emails. The Mail apples once a great way to streamline my communications. That seems to no longer be a reality for me.

UPDATE: I spoke to Apple Support, everything they tried did not work. I was escalated to a Senior Apple Agent who advised that this seems to be an issue for Google (although I am not convinced it is) and I should update my OS.

So far I am reaching 7 hours of trying to fix this issue. Beyond frustrated at the moment.

I am having the same exact issue as outlined above. When I create a gmail account as soon as I select the "Done" button on the page with "Select the apps you want to use with this account". Nothing happens. Please help!

To find out if it's system wide or user specific, try this...

Open System Preferences>Users & Groups, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.

Does it work in the new account?

Exactly the same issue as many others. One gmail based account started acting up, continually asking for password, but not allowing you to put it in. I deleted it, but can get it ok on my phone or if I log in via gmail in browser. Same now happening for two other gmail based accounts. I have deleted them from my mail app, with intention of re-installing them - but it won't let me do that. Gets stuck on the first screen as soon as you put the email address in and press next....

This is obviously some sort of bigger issue with the app as so many of us have the same problem.

Its annoying, but the fact calendars aren't syncing too is my big concern....so many appointments that only exist in that app etc. Does someone have a simple straightforward solution or do I need to go to a genius store or something?

The hint with the Keychain saved my day.

I have changed the password of my email account, but Mail does not save the new password for the SMTP server. Therefore I removed the email account and tried to add it again, but then it hangs at the window where I selected only to sync my mails and not the notices etc.

I closed Mail and opened Keychain. There I searched for all entries that may relate to the email account and I removed them. Then I started Mail again and adding the email account works fine.

I was having this problem trying to add a mail (not gmail) account just for Notes. In my ~/Library/Keychains folder, I found a subfolder with a long hexadecimal and hyphens name. I deleted that subfolder, logged out, and logged back in. I was then able to add the account, without having lost any passwords from my keychains.

I had the same problem with adding a simple IMAP mail account - "next" button in endless loop, could not create it.

Deleting entries for email in keychain did not help.

I took a backup of the user keychain files ~/Library/Keychains

Then followed advice from ED in PA:

1. Open the Keychain Access utility in your Applications folder.

2. In the "Keychain Access" dropdown list, open "Preferences..."

3. Click "Reset My Default Keychains" and follow the prompts.

4. Restart your computer.

Now it was possible to create the mailbox and all old mails was loaded.

But all passwords were lost.

So I imported a backup file by "Add keychain". It seems it does not restore the passwords, but I can look them up in the imported keychain in Keychain app.

(My mac has Norwegian interface, so some of the terme may be misspelled)

Amazing advice Mth222

This worked for me!!!

So pleased I found this thread!

I had to resort to GMAIL in web browser for a day whilst researching what I had to do.. and spent about 2 hours this morning following all the steps above.

Cannot recommend it enough to others having the same issue!

THANK YOU!!!!!

Yes. I had to authenticate and then I had to authenticate a 2nd time. Due to their 2step verification. We’ll see if it sticks this time.

However I am unable to add imap or pop accounts. After you get to the screen where you put it outgoing and incoming servers hit continue and the wheel just spins and nothing happens.

To find out if it's system wide or user specific, try this...

Open System Preferences>Users & Groups, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.

Does it work in the new account?