Icloud connect failure

Description
Icloud account has repeated connection failure.

To Reproduce…

Steps to reproduce the behavior:

  1. Start mailspring

Expected Behavior
expect my icloud account to sync - it does not sync
I get a red error -
Go to preferences to re connect account.
I get an error that says "Sorry this folder does not exist (IMAP)

Screenshots
reconnect
Setup

Mailspring Version: 1.9.1-30ef802f
Platform: linux
Pop!_OS 20.10

Install method -

snap from the snap store

Additional Context
I am only having problems with icloud. Gmail and Exchange are both working. I cannot post the log info because I am a “new user” and am only allowed “2 links” go figure.

This is what is in the error log mentioned below

Mailspring Version: 1.9.1-30ef802f
Platform: linux
Account State: sync_error
Account Provider: icloud
IMAP Server: imap dot mail dot me dot com
SMTP Server: smtp dot mail dot me dot com
--------------------------------------------
***

128680 [2021-04-29 18:39:53.424] [main] [info] Identity created at 1566074685 - using ID Schema 1
128680 [2021-04-29 18:39:53.425] [main] [info] ------------- Starting Sync (knussear@mac.com) ---------------
128680 [2021-04-29 18:39:53.429] [metadata] [info] Metadata delta stream starting...
128680 [2021-04-29 18:39:55.429] [background] [info] Marking all folders as `busy`
128680 [2021-04-29 18:39:55.434] [background] [info] Syncing folder list...
128680 [2021-04-29 18:39:55.861] [background] [critical] 
***
*** Mailspring Sync 
*** An exception occurred during program execution: 
*** {"debuginfo":"syncFoldersAndLabels - fetchAllFolders","key":"ErrorNonExistantFolder","retryable":false,"what":"std::exception"}
***

128703 [2021-04-29 18:39:56.010] [main] [info] Identity created at 1566074685 - using ID Schema 1
128703 [2021-04-29 18:39:56.011] [main] [info] ------------- Starting Sync (knussear@mac.com) ---------------
128703 [2021-04-29 18:39:56.015] [metadata] [info] Metadata delta stream starting...
128703 [2021-04-29 18:39:58.015] [background] [info] Marking all folders as `busy`
128703 [2021-04-29 18:39:58.021] [background] [info] Syncing folder list...
128703 [2021-04-29 18:39:58.423] [background] [critical] 
***
*** Mailspring Sync 
*** An exception occurred during program execution: 
*** {"debuginfo":"syncFoldersAndLabels - fetchAllFolders","key":"ErrorNonExistantFolder","retryable":false,"what":"std::exception"}
***

128722 [2021-04-29 18:39:58.569] [main] [info] Identity created at 1566074685 - using ID Schema 1
128722 [2021-04-29 18:39:58.570] [main] [info] ------------- Starting Sync (knussear@mac.com) ---------------
128722 [2021-04-29 18:39:58.573] [metadata] [info] Metadata delta stream starting...
128722 [2021-04-29 18:40:00.573] [background] [info] Marking all folders as `busy`
128722 [2021-04-29 18:40:00.578] [background] [info] Syncing folder list...
128722 [2021-04-29 18:40:00.953] [background] [critical] 
***
*** Mailspring Sync 
*** An exception occurred during program execution: 
*** {"debuginfo":"syncFoldersAndLabels - fetchAllFolders","key":"ErrorNonExistantFolder","retryable":false,"what":"std::exception"}
***

128738 [2021-04-29 18:40:01.100] [main] [info] Identity created at 1566074685 - using ID Schema 1
128738 [2021-04-29 18:40:01.101] [main] [info] ------------- Starting Sync (knussear@mac.com) ---------------
128738 [2021-04-29 18:40:01.105] [metadata] [info] Metadata delta stream starting...
128738 [2021-04-29 18:40:03.105] [background] [info] Marking all folders as `busy`
128738 [2021-04-29 18:40:03.110] [background] [info] Syncing folder list...
128738 [2021-04-29 18:40:03.608] [background] [critical] 
***
*** Mailspring Sync 
*** An exception occurred during program execution: 
*** {"debuginfo":"syncFoldersAndLabels - fetchAllFolders","key":"ErrorNonExistantFolder","retryable":false,"what":"std::exception"}
***

Did you request your app-specific password from Apple, then paste that into the appropriate text window?

Yes - I have had mail successfully running for nearly a year. This is a recent problem