Can't insert trello boards into Ms Loop

[Γιάννης Μπερδούσης]

Hello, I'm trying to insert a trello Board into Ms loop, but I can't. When I push the "allow" button in order to connect the two services, then nothing happens, I just got a blank window.  I use a 365 ms bussines subscription and I have give the right permissions to my account from the admin center. Any idea?