Hi @Jim,
Per my test, I can access the sharepoint sites by following steps, please make a reference
- Add a new user in Microsoft 365 admin center by clcik add a user in Active users.
- Sign in to the site with new created user and send access request
- Login the sharepoint site with admin account and go to Site Contents
- Click on Access Requests and approve the request
- Then open a new tab and access the site with the new created user. If you just refesh the page in request page, you will still get access request as return.
If you still get the access error after following the steps, you cloud check the setting in the document
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