[ CONSULTA ] iPad getting the wrong text messages

[vERONIZ]

Ok this one has me a little stumped. My friend just got an iPhone (11 Max) from her work, she also has a personal phone, iPhone (not sure which), that she will soon give up. She also has an iPad. All 3 are on the same Apple ID. Right now the iPad gets text messages from the personal phone only. ASAP or at least once the personal phone goes away, she wants the work phone texts to go to the iPad. How can I make this happen for her? Will it just happen when the old phone goes away? Is there a setting I need to tweak?