שירות אחסון וסנכרון קבצים של Microsoft.
Hi ,
I'm Dyari. Thanks for reaching out. I will be happy to assist you in this regard.
This error appears due to a backend issue on Microsoft’s side.
Please wait 30 minutes, then try adding the 6th user again but ensure the user is eligible. The email must be a personal Microsoft account. Work or school accounts cannot be added to Microsoft 365 Family.
If it does not help, close the browser, reopen it, and sign in again or use a different browser or device.