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I still have this issue on 1003495030914 (test phone) with the latest update. 
When I start the game on a new Sim day I always get 'Failed to Join Party'. 
When I want to start a party I get:
Party failed to start. [Network Error 450]
Just booted my phone, failed to join was first between 3:15 and 3:45.
I have a feeling it's to do with neglecting the game for a good while after having had a party.
@Phantomlover1717 do you remember if your party was active and did you then update to Client 16 on that device?
- Phantomlover17177 years agoLegendI've had this issue on that device for at least 5 months. On April 20th is the first time I noticed this error. 
 On April 13th I've first noticed the Failed to join party issue. As it's not my main game I sometimes forget about it for months.
 I think I went to a party on my main account and left my game there and forgot about it. I might have had an update between then and going back in to that game.
 For now, every time I start the game for the first time that day I get a 'Failed to join party' error to stays away until the next day. And every single time I want to start a party I get the 'Party failed to start [Network error 450]'.
- 6 years ago@SimGuruMaaike I have the same problem . I can't host the party. it show a window says 「party failed to start,network error 450」.It happen since Wednesday, please help to fixed it.
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