I followed this guide, but I always encounter the same problem (How do I add an Office365 account?). It’s my university email. I don’t have the same problem with Thunderbird on Windows. Can someone help me? Thanks in advance.
It’s exactly as the errors indicate: You need an admin from your Alma mater to approve K-9 to access your account.
All MUAs come with a unique application ID that needs to be granted access. Whatever is not on the whitelist gets blocked.
Get used to it… Many corporate policies that do not include BYOD or are very strict about security will present you with the same issue. You need to convince the admin that your MUA is safe and adheres to corporate policies; they might then add your MUA to the whitelist.
Will the application ID be the same as that of Thunderbird Desktop when K-9 Mail officially becomes Thunderbird Android? It happens that the admin refuses to add K-9 Mail (due to lack of users), but they added Thunderbird Desktop.