Hello Inna Mednyk,
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.
Issue:
How to Enabled IP Access Control on Compute Plane in Databricks workspace when no one can connect to the workspace due toan entry of the wrong IP address (outbound nat gateway IP )
Solution:
This was resolved by creating a VM and ensuring it had a static public IP address specified in the Databricks IP ACL. From there, we removed the IP access list and set the 'Enforce IP access list on Compute Plane Requests' toggle to 'False' using the Databricks CLI. Now, everyone can access the workspace
Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.