Thanks for your post.
Do you mean all the receivers
(be them Hotmail users or Microsoft Online Services IDs) cannot accept the invitation
and enter your SharePoint team site? If so, we recommend you to enter Site Collection Features page again to
deactivate the External user invitations
feature, wait for a period and then re-activate it.
Additionally, currently
SharePoint Online only support invitation of external users who have Hotmail
accounts or Microsoft Online Services Ids. Would you please try to invite another
Office 365 user outside your organization to see if he can accept the
invitation?
If the issue still
persists, please feel free to notice me here. We’ll try other troubleshooting ways
to help resolve it.
Regards,
Ella Huang