Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello,
Thanks again for your patience while we figure out a valid solution for this issue. We have created an article that provides a workaround to remove the activation window message from reappearing: https://support.microsoft.com/en-us/kb/3170450.
Our engineering team is working on fixing this issue moving forward but we hope that the link above will resolve this issue on your machines via this workaround.
Thanks,
Michelle V
The Office Team