Hello Mark Topash1,
Thank you for your reply,
The exchange Admin picture i have shared above is from your on-prem side i mean exchange server, so if your Organization is in hybrid environment you need to contact the Admin who have access to your on-prem side ( exchange server).
If your EWS URL begins with office.office365.com, then you are on Office 365.
- Open Outlook, then click File on the top-left corner.

2-Under Account Settings, this will indicate your email server's address.

For example, if you see https://mail.affinity.co/owa/mail.com in the result above. Your EWS URL would be https://mail.affinity.co/ews/exchange.asmx.

Please feel free to let us know if there are any questions or if we got you wrong. We will continue to assist you based on the information you provide. We sincerely appreciate your patience and cooperation.
Sincerely,
Eben Ezer Tres | Microsoft Community Moderator