Exchange Hybrid Migration Endpoint cannot be created

We cannot create an Exchange hybrid migration endpoint using remote server and the error when we create bypass verification is

Error: CommunicationErrorTransientException: The call to 'https://mail.foxvalleyfire.com/EWS/mrsproxy.svc' failed. Error details: The HTTP request was forbidden with client authentication scheme 'Negotiate'.. --> The HTTP request was forbidden with client authentication scheme 'Negotiate'.

We have check on Exchange on prem server and found that the MRSproxy has turned on. What do we need to check from on premise? Please refer to below for the error