HTTP Error 503 when Trying to Open Paginated Reports on Power BI Report Server

I recently published dashboards and paginated reports on my Power BI Report Server. While the dashboards are accessible, I'm encountering an issue when trying to open paginated reports. Every time I attempt to access a paginated report, I receive the following error message: "HTTP Error 503. The service is unavailable." This issue is preventing me from accessing and utilizing my paginated reports.

Troubleshooting Steps Taken:
I've taken the following steps to troubleshoot the problem but have had no success:

Checked the server's general health and status.
Verified that the paginated reports are correctly published.
Verified that paginated reports are correctly connected to their data sources.
Restarted the server multiple times in an attempt to resolve the issue.

I'm seeking guidance on how to resolve the "HTTP Error 503" issue and regain access to my paginated reports. If anyone has encountered a similar problem or has insights on potential solutions, I would greatly appreciate your help.