Microsoft Exchange account stops working in Apple Mail - Enter Password

Issue

Microsoft Office 365 Exchange account stops working in Apple Mail on macOS. Apple Mail and Internet Accounts in System Preferences prompt to re-enter Microsoft Exchange account password, but after the correct password is entered, just shows spinning wheel icon indefinitely.

Enter the password for account

TeamViewer on Mac - You are currently offline. Please check your internet connection

Issue

Mac OS version of TeamViewer 15 displays the following message in Computers & Contacts tab:

Teamviewer  - You are currently offline

You are currently offline
Please check your internet connection.
The application is trying to reconnect

The computer is actually online and TeamViewer can connect to clients by manually entering ID and Password. It's just Computers & Contacts section that doesn't work.

Time Machine couldn't complete the backup - an error occurred while copying files...

Issue

Time Machine on MacBook Air fails every time with the following error:

Time Machine backup failed

Time Machine couldn't complete the backup to "MacBook Air Time Capsule".
An error occurred while copying files. The problemmay be temporary. If the problem persists, use DiskUtility to repair your backup disk.

Other MacBooks backup to the same Time Capsule disk with no issues.

Your iCloud Music Library session has expired

Issue

Every time MacBook resumes from sleep following iTunes message is displayed:

Your iCloud music library session has expired

Your iCloud Music Library session has expired.
Your iCloud Music Library session has expired. To reconnect, sign in with your Apple ID and password.

After entering correct password the message goes away, but only until MacBook resumes from sleep again.

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