Hi Richard,
Thank you for posting your concern here in the Community Forum. We understand that you have tried all possible resolutions to fix your Outlook for Android app when accessing your IMAP email account. Accurate configuration settings might be needed to solve this matter. No worries let me direct you to best avenue to get this resolved effectively.
In this case, let me point you to the proper support team who are indeed equipped to perform the advanced troubleshooting to get this issue addressed. Please get in touch with our Outlook In-App Support by following the steps provided in this article. Rest assured that they will be able to exhaust all resources for this problem.
We hope to get this sorted soon. Please don’t hesitate to get back to us if you need further assistance.