Hello there,
Thank you for reaching out.
We understand you're experiencing issues adding a friend in Destiny 2. What you describe experiencing does sound strange. By any chance, have you verified whether you experience these same issues if adding your friend or accepting their request via Bungie.net rather than in-game?
Also, considering your friend is on a different platform, have you disabled [url=https://help.bungie.net/hc/en-us/articles/4403006598164-Destiny-2-Cross-Play-Guide]Cross Play[/url] in the past? If yes, have you re-enabled it, but are still experiencing this?
Their friend request won't show up on bungie.net. i blocked the glitched friend request account which ended with a different bungie number in game, but their actual bungie account showed up on my blocked list on the bungie.net block list. I've also never turned cross play off and neither have they as we're both on PC.
edit: i joined them with the /join command and saw their bungie ID number change in real time while hovering over their name
edit 2: now they show up on my friends list, still with a different bungie ID, but they still show up in my friend requests as well
Hello again,
Thank you for the detailed follow-up.
We have taken note of your report concerning what you're experiencing with this particular friend in Destiny 2.