Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
I had the same issue with a shared email account across multiple iOS devices (iPhone 6/12, iPad). I had used the Exchange option when adding other Office365 email accounts, but was using IMAP for the shared email account, which is where I believe my problem was.
To fix I removed the IMAP shared email account from the devices, and added it using the Exchange option and selecting Sign On rather than setting up manually.