Hey dollenick, if you are using cpanel hosting then maybe it is modsecurity that is causing the issue, so if that is the hosting platform they usually have a setting you can use to disable it.
If you not on cpanel and on some other platform then ask the host if they have modsec running and to disable it for you to test if that was the problem 🙂
This is only a suggestion to look at if you on cpanel.
Regards
Megan
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