Attempting to add an additional member to an ArcGIS Online organization fails and returns the error message below:
Error: Your organization has reached the maximum number of members your current subscription allows. This limit includes pending invitations.
Depending on the cause, follow one of the workarounds below to resolve the error.
Assign an available user type in ArcGIS Online
If there are not enough of a particular user type in an organization, assign an available user type to the organization member.
Note: Before changing an organization member's user type to one with fewer capabilities, ensure that the necessary requisites are fulfilled. Refer to ArcGIS Online: User types for more information.
Reassign a license in ArcGIS Online
Remove the license from an organization member and assign it to the preferred organization member in ArcGIS Online.
Renew an expired subscription or purchase an additional license
Please contact a customer service representative to renew an ArcGIS Online organization subscription, or purchase additional licenses for the ArcGIS Online organization.