I use Client.Channels_InviteToChannel but it asks for access_hash.
How do I suppose to get access_hash if I never interacted with bot before ?

Note that I’m admin of channel. Also have bot’s token.
I can do that manually using telegram app.

Dim BotFullUser = Await Client.Client.Users_GetFullUser(New InputUser(BotId, 0)) 
'FAILS HERE
'TL.RpcException: 400 USER_ID_INVALID

Dim BotUser = New InputUser(BotId, BotFullUser.users.ElementAt(0).Value.access_hash)
Dim Ch = "{channel_id}:{channel_hash}".Split(":")
Await Client.Client.Channels_InviteToChannel(New InputChannel(Long.Parse(Ch(0)), Long.Parse(Ch(1))), BotUser)