iMessage Error

I have one primary Number and which associate with my appleID. I changed my physical Sim (Vodafone) to E Sim So I can add the Secondary Phone number which is physical (O2)Sim to my iPhone 15 pro max now. Ive checked my numbers and its in right order in terms of primary/Secondary. now I've got this note on my iMessage that "this number is registered to your apple id but not associate with this phone you can keep using the number for iMessage and FaceTime till it expires. I don't know what to do to sort this please help. Thanks