Sharepoint list based from existing list no longer works with infopath

Occasional Visitor

Due to PowerApps being like it is, we still use infopath for basic form design and info from users, however, no we have encountered an issue.  Some of the lists have a large amount of fields so we create a new list from existing and have done so until dec 2020 with no issue.  Now unfortunately, we can still create the list in sharepoint (O365) but when customising the infopath form, i receive an unhelpful message as per below.  anyone else had any dramas with this?

   InfoPath Editor
   The publish operation could not be completed. It cannot be determined if the form template was successfully published. Try publishing the form template again, or change the list settings to use the default SharePoint form. Catastrophic failure
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