When you marry a god or deity that is an ancient being they will always have more than one spouse. Him being ‘taken’ is not an issue as marrying a deity does not mean they are monogamous. Deities and gods are multi-dimensional beings.
I hope you are not just evoking Anubis in the hopes of marriage with him and having a sexual relationship. It is alright if that is your goal eventually but if it’s the sole purpose as to why you want to be around him without ever having communication with him then he’d definitely not be worth his time. Remember gods/deities/demons often times know why you’re evoking them before you even evoke them and are aware of what your intentions can be.