adding crossplay friend on ps4 from xbox

Product: Apex Legends
Platform:Xbox Series X
Please specify your platform model. Microsoft Xbox One X
What is your gamertag/PSN ID/EA Account name? Elgipsyboy
Please provide your squad mates' gamertag/PSN ID/EA Account name if possible. gitan-maniax
Are you using any software with an overlay? No
Which Legend were you playing (if applicable)? any
Which Legends were your squad mates using (if applicable)? any
Where did the issue occur? In the lobby (waiting area before the match)
Which part of the map or menu were you in? If you don't remember the exact name, please describe the area or what you were trying to do in the menu. in the add friend section
What were you doing when the issue occurred? E.g. respawning a squad mate at a beacon, using an ability, a squad mate left the game. trying to add a friend
Did your squad mates also experience the issue? Yes
How many matches had you played in a row before the issue occurred? 0
When did this happen? (dd.mm.yy hh:mm) 13/03/2021 21h30 gmt+1
How often does the bug occur? Every time (100%)
How severe is your issue? Major impacts to gameplay
What happens when the bug occurs? I can't add my ps4 friend and same to him i can't find him in the search of friends
What should be happening instead? I should be able to find him in the search with his gamertag
Steps: How can we find the bug ourselves? search for my name when trying to add a friend and you'll have no results "Elgipsyboy"

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Please help me i'm trying to add a friend from ps4 for several days and we can't find eachother in the friends search