I'm trying to run junit test cases from ado and i see 403 error in the results

I'm trying to run junit test cases from ado and i see 403 error in the results. currently our ADO is in central us region and we are using azure hosted agents. I have whitelisted the ip's for central us and azure hosted agents. still getting the 403 error. can you please share me the ip which we need to whitelist and if I'm missing anything