First question is why you need a 1 to 1 association between your entities when you can put it in one entity. It is just more efficient that way. However, based on your domain model I can see that you want two address types; what I will do is have a 1 to many association to address and have an 'address type’. That's just another way
Secondly, if you choose to do it your way, make sure you set your security rights to both read and write for the fields that you need to modify. Make sure you set the association between both entities. Will be good to also see the Microflow that you have to set your association.
Sometimes, check the dataview. Éditable’is set to No sometimes, so set it to yes.