I asked this on the RMS forum, but no reply as of yet, so please pardon the cross posting.
Does anyone happen to know if RCP v.5.04 works with php8?
The previous version 4.18.6 (I think that was the previous version) had problems with sending receipt emails and possibly other issues with php8 as i recall.
I had up until recently used RCP 5.04 with php8, it worked fine, however the bug that prevented receipt emails still existed. Sometimes they were sent other times not.