I can’t listen the music for 90 days, what it means?

I have an apple one family subscription that includes music, however if id bought a CD and imported it to my MacBook, it would then only appear on my devices, which makes sense as anything I add from Apple Music I see on all my device, and naturally for example don't see anything my husband adds to his music. But if we both want to listen to it an its in Apple Music then we could both add to library.

There are however times when either music isn't available in Apple Music or I want the physical format. Goes with out saying anyone in the household can pick the CD up and listen to it.

When my husband then wanted CD on his said iOS device this could only be done by switching ID's on the MacBook. I now have the 90 day warning on my MacBook which is very frustrating to not be able to listen too purchases (I've only had apple one this year)

Can anyone see any other way my husband and I can have a CD imported to our iOS device without having to sign in and out and then have the above associated message.