Expired patrons should not be allowed to place ILL request on OPAC. The SysPref BlockExpiredPatronOPACActions should be checked and if it is set to 'Block' the patron should be blocked from placing ILL request as well as the other OPAC actions.
I believe this is a duplicate of Bug 34597 resolved in 24.11 but as an aside we are thinking about whether people with blocked accounts should be able to place ILLs or even a Purchase suggestion, for that matter. I suspect I'll be adding bug reports to seek these limits on activity when the borrower is not playing by the rules.
*** This bug has been marked as a duplicate of bug 34597 ***