403 Error

Hello. One of my client's sites is returning a 403 error. I have whitelisted the IP addresses through our security plugin and have spoken to my hosting platform, Siteground, and they assure me the site is not blocking Bugsmash IP addresses.

They said "The program is using a script that requires a user agent to execute the script. The user agent for the program needs to be updated to Chrome 149 at least so that it is able to work."

I  have multiple sites on Bugsmash that are also on my Siteground server that are not returning this error so I can't figure out why just this one is. Can you help with this?