@KjstechO365 I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to "Accept " the answer.
Summarize the issue & steps you have taken to resolve this, as it would help other community members facing similar issue.
Issue: Unable to see anything in Enterprise Applications in Microsoft Entra Admin center, even though you logged in using admin roles which are required.
Solution: You further investigated from the networking standpoint, There was an expired DigiCert SHA2 Secure Server CA loaded in our Palo Alto firewalls.
Under Certificate Management > Certificates, deleted it, and pushed to firewalls. Refreshed page and now everything loads properly.
Please remember to "Accept Answer", so that others in the community facing similar issues can easily find the solution.