Must an evicted squatter be given notice in a quiet title process in Alabama?

[Micki Ray Harper]

I am five months in quieting a title on a home/property that was initially obtained by my father in a tax sale. (Tax certificate in 2019, with tax deed in 2022 and taxes are current).  In January 2023, he started eviction proceedings on squatters in the home and won a judgement by default in May of 2023 and the squatters moved out. I obtained the property through a quit claim deed from my father. My attorney stated not only must the person who failed to pay taxes be given notice but also the squatter as well since our suit names persons who were in possession of the house. We never collected any money for rent from anyone.  The squatter stated he didn't know where the owner was or where he lived.   If we can't get an address to either party to mail a certified letter then a private investigator must be hired to locate them.  The squatter possibly has warrants on him and will be difficult to locate.  I did attempt to get a quit claim deed from the other party but he didn't return my calls.  I have read so many posts from Denise Evans but I don't fully understand the 'giving notice' aspect.  Any insight into this will be greatly appreciated.