I've been successfully testing an approval Flow that I am building and have been receiving the emails I am sending from a 'Start and wait for an approval', with an approval button in Outlook Online. I have been using this button to approve/reject over the past week but yesterday it suddenly stopped working with a message saying 'An error has occurred. Please try again later'. I have searched this forum and followed various recommendations to disable/enable the Flow license, delete cache and cookies to no avail.
Does anyone have any suggestions? I can approve the flow through the Flow interface but it takes much longer and I also want users of the Flow to eventually use the ease of approval provided through Outlook.