Cannot add a group member using Outlook online

[pnparadis]

Hi all, 

Anyone having difficulties adding a member to an Office 365 group using Outlook online? I cannot do it anymore. The "add members" people picker does not return anything anymore. Here's a screenshot, it will give you a better idea: 

It works from any other tools like the desktop version of Outlook or Teams. 

Any Idea? 

Thanks! 

[#2]

Seems to work fine here, which browser did you use and have you tested others? Also private session, etc?

[#3]

@Vasil Michev I've tried Chrome, Edge, Ice Dragon (based on firefox), private or not, it's not working. 

[#4]

Open a support case then, as it might be something specific to your tenant.