Some of my mailbox folders are not syncing from iMac to iPhone. iMac running Big Sur
How to get mailbox folders in iMac to sync with iPhone?
iPhone 12 mini, iOS 15
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Sign in with the same Apple ID & password say example1@icloud.com on your iPhone & Mac and connect both with an usb cable .Overview of syncing your Mac and your devices - Apple Support
Click on finder > general > sync
Let the bar be completely loaded .
Open your mailbox in iPhone
Click on edit option on the up-right corner
Click on “new mailbox” option on your down-right corner ,
In the new mail box , in the name section enter your iCloud id say example1@icloud.com
And set your mailbox location as per you requirement (iCloud / gmail) - prefer iCloud
Then again click on edit , you will see your apple id , under it you will find an option of “new mailbox '’on your right corner > chose the name for your folder and add the mailbox location ( iCloud id )> click on save > finally click on done .
The folder is created in iPhone , from web browser ( mac ) open www.icoud.com in mail section in the bottom left corner click on refresh , the mail folders will be visible after few moments , then open IMAP account in mac Add or remove email accounts in Mail on Mac - Apple Support under iCloud section in the bottom click on drop down arrows all mail folders will appear .