Can’t access time machine backup files on WD My Passport

Any help on that error here?

https://medium.com/@acecilia/mac-and-time-machine-inherit-a-backup-from-another-computer-dbad4d8aad79

Yes that looks good to go.

From Disk Utility, try running the First Aid on your Time Machine Disk

Yikes, you don't want to change your name at all.

I recently got a 1 tb my passport external hard drive to do a time machine backup of my old computer (iMac from 2010 with High Sierra) so I could access its files on my new MacBook Pro (Mojave). It kept saying that I didn’t have permission to view its files.

I reformatted the drive

How is that drive formatted? TM need both GUID and Extended Journaled

Formatting/erasing/partition of course wipes all data

Verify from Disk Utility>View>Show All Devices and you are initializing the Parent drive

Time Machine organizes backups on external media by the computer name that you assign the Mac in System Preferences : Sharing. If you do not use that exact name, and the same exact username and user id on the new Mac, then rightly so, Time Machine will tell you that you do not have permission to access that content, and you get the red badge.

Set your short username, and computer name on the new Mac to match those on the old Mac, and provided your user id is 501 on the new Mac, you should have a cooperative restoration without permissions issues.

"Inherit" a backup 

Copy the following after the prompt, and leave a space, but do not press Return yet:

                            sudo tmutil inheritbackup 

If your backups are on an external HD, locate and open the drive in the Finder window. At the top level of the drive is a Backups.backupdb folder containing a folder named for your old Mac, per the sample. This is what you want the new Mac to "inherit." Drag that folder to theTerminal window.  

(If your backups are on a Time Capsule or other network location, find the sparse bundle containing the backups for your old Mac via the Finder, per the green box below, and drag it to the Terminal window):

Terminal will supply the "path" to the dragged folder or sparse bundle (underlined in red): 

Note that it will insert a back slash (\) before any spaces in the names. That's normal.

Press Return, enter your Admin password if prompted (it won't be shown) and press Returnagain.

Looks like permission problems...

http://www.baligu.com/pondini/TM/B6.html