Can I block Cloud OAuth 2.0 app REST API for Security?

[Tom]

We have registered a whitelist for accessing only the URLs permitted by the internal Proxy.

OK https://company1.atlassian.net

OK https://api.atlasian.com (And other necessary domain)

NG https://myself.atlassian.net  (User's personal website)

User cannot access myself.atlassian.net from company.

But if use a OAuth 2.0 app, can call api form api.atlassian.com/ex/jira bypass access to  myself.atlassian.net.

Question:

Can I block rest api from  OAuth 2.0 app in my proxy? I think two ways.

AND  will anyelse affect to jira/wiki's normally use?

1. block "api.atlassian.com/ex/"
2. block "api.atlassian.com" witch contain "Authorization: Bearer" in HTTP header

OAuth 2.0 document (3.2 Construct the request URL)

https://developer.atlassian.com/cloud/jira/platform/oauth-2-3lo-apps/

[Deleted user]

Hello @Tom 

I've never heard of anyone wanting to block access to the OAuth 2.0 mechanisms for 'security'.

Why not try it, see what what effect it has, then come back and provide a full report of the outcome? That way, if anyone else ever thinks of doing it in the future, they will know what to expect.