Microsoft has addressed ongoing difficulties with sign-in issues and user access management that advertisers have experienced in Microsoft Advertising. Advertisers previously encountered blank pages and redirects when attempting to sign in.
The sign-in process now includes clearer browser troubleshooting guidance, plain-language error messages, and more specific recovery steps. Additionally, Microsoft Advertising has made user management simpler by improving the understanding of roles, permissions, and ensuring persistent sign-in behavior.

Admins can now access pages with clearer guidance on account access requirements, review pending and expired invitations, and gain insight into next steps. These enhancements are part of a larger effort to improve the user interface based on advertiser feedback, with more updates expected in the future.
Read the official announcement here: Product Newsletter.