Nickname notifications

When i receive notifications from my boyfriend it doesn’t show up as the nickname i’ve given him (private dm’s) when he texts/calls me on discord. I’m experiencing it on my phone (iPhone 14 Plus) and on my pc. Both are updated to the latest update. It only started happening after i got my new phone back in December (14 Plus), it worked completely fine on my old (iPhone X). i’ve deleted, reinstalled the app on both devices multiple times, changed the nickname as well multiple times. We’re in servers with specific nicknames as well and there they work completely fine.