That sounds exactly like a Commercial Music Library (CML) issue. Quick question: Did you recently switch your account from Personal to Business or Creator?

It absolutely does. When you switch to a Business Account, you legally become a commercial entity. This changes the music you’re allowed to use for two major reasons:
1. Licensing: Business accounts are strictly limited to the Commercial Music Library (CML). This library contains music that has already been pre-cleared for promotional and commercial use. This CML is much smaller than the library available to personal users.
2. Copyright Risk: The music you hear trending (often big pop songs) is typically only licensed for personal, non-commercial use (i.e., people dancing, lip-syncing, or sharing a moment). If a business uses it to promote a product, service, or brand (like your fitness program), the copyright holder can issue a takedown.
Key Distinction: Personal accounts is from blanket licenses for non-commercial use. Business accounts must only use music explicitly cleared for advertising and promotion.

If you don’t need the specific business features (like the specific demographic analytics or the direct shop link), the easiest fix is to switch your account back to Personal/Creator. You’ll regain access to the full, massive sound library, and your muting issues will likely disappear instantly.