Link for TV support/manual: https://shop.panasonic.com/support-only/TC-P42ST30.html
@NeedHelp1 Thanks for the note.
Have you tried following the steps here to keep selecting different codes for your TV brand to see if one helps get things back on track? https://support.roku.com/article/360004786894-why-is-my-roku-enhanced-remote-not-controlling-volume-...
This can often be required for manufacturers that use multiple IR remote codes. If that still isn't clearing up the issue, please let us know.
Thanks for checking back in on this! I'll try your suggestions.