Your appliance is still under warranty . Give BSH a call and they should send someone out to help . I’ve done loads of these recently and it seems like they’ve been put on too tight in the factory. TBH , 99{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} of the time its a 2 minute job.
If you’re still trying , make sure you take the door off as this gives better access and if you’re right handed , try undoing it left handed as you get much better leverage .
Personally , i use a plastic hammer and wide bladed screwdriver to give the glass a ‘helping’ hand in the right direction to help with loosening it up although i wouldn’t advise you to use this method yourself 😀