Hi @Gary Phetteplace ,
Since you are not aware of any Azure management and you are the administrator, I believe the problem has nothing to do with your end.
This problem to me looks more like stemming from the website you are trying to access. If you have this 403 error only on that website, or any other website that is related to it, I would suggest you contact the site owner to see if they have somehow blocked your access via Azure application gateway. The error message you have provided often leads to that possibility.
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Best Regards,
Shijie Li