Setting up a group in Outlook

[trainingthefuture]

Hi 

I am new to 365, I have followed the instruction to sharing a SharePoint page, I have come to setting up a group but then get a message stating 'This group does not allow addition of guests due to company policy'

Is this something I can change.

Also if I add a new user, will I have to pay for them as part of my month subscription?

[#2]

I'm seeing the same thing - must be a bug as I'm able to add guests to the same group using desktop Outlook.
Adding a user who is not part of your tenant as a guest does not add them to your subscription count.

[#3]

You have to ask your Microsoft 365 administrator to change the policies to allow guests in 365 groups and access to SharePoint.