I'm sorry to hear you're experiencing problems with logging on to WorkMail. Often this issue occurs when the mailbox is locked. Some process try to log on to the mailbox with a incorrect password which results in to many failed login attempts and the mailbox is temporarily locked.
You can check all you apps to ensure they use the correct password but if that is not the case you can restrict access to your WorkMail organization via access control rules.
Kind regards, Robin
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