Cannot Create Account (when Php Ver > 8.0)

As per this thread, I have disabled Facebook login however I still get an error if I click People > Create Account in Sytist back end.

When I downgrade to PHP7.3 the error goes away.

Need to keep our server up to date as we host sites for others, any idea how to resolve this?

Are you on the current Sytist version if 4.3? Sytist became compatible with PHP 8 with version 4.1.0 May 3, 2022.

Thanks.

Tried to upgrade today but card declined, had this problem recently from another US supplier and I think it's related to the UK's new regulations around 3D Secure (visa payment auth) - I will raise a support ticket directly rather than discuss on here, hopefully there's a way around it? Thanks