Dashboard sharing URLs not working

For the last couple of weeks, we are having an issue sharing dashboards. The share feature works, but users are only able to view the reports by going to "Shared with me" in the online service. The actual URL generated in the "Share" section generates a security/permissions error. This is happening in multiple workspaces, for multiple dashboards (without RLS), in multiple browsers. Even dashboard creators receive this error when attempting to use the URL to view the dashboard.

(I've also posted this in the Service forum, in case this is not the correct place to post this request for help.)

The text of the error details is as follows: