Please can someone from PG Music answer this question for me.

I am having problems releasing my original songs through LANDR when they include BIAB Realtracks.

My latest release has stalled because of this very issue and I have received the following email from them:

Hey there,
Thanks for releasing with LANDR!
Looks like you may have used samples or borrowed content in your release with UPC 628810692224.
No worries, this happens a lot. We’re here to help you avoid problems with your music after it’s released.
We just need to double-check that you have permission to use any copyrighted material.
Here’s how to get your release live as quickly as possible. Reply to this email with:
- Any beat license(s) and proof of payment
- The source of your samples (DAW, sample marketplace, etc.)
If you’re releasing a remix, reply to this email with:
1. Authorization from the original creator for use of the composition
2. Authorization from the master recording owner to reuse the audio
If you are moving previously released tracks, reply to this email with:
- The name of your former distributor
The faster you reply the quicker we’ll be able to get your release live!
Thank you for your patience,
The LANDR Team

Do I have permission, or do I need to formally request it from PG Music, or even the individual session musicians who provided the recordings ?
I cannot readily find anything in my BIAB manual regarding this subject.

https://linktr.ee/andyshearer