I didn't investigated this, but my first though is that these users have a poor channel reachability to coordinators nodes. Do you think it's another problem?
Discussion
I did two purchases on Robosats, both times the deposit locked without a glitch. Both times the LN invoice to receive the funds wouldn't stick. I was lucky ToS accepts onchain, otherwise I imagine I would have lost the deposit.
I use LN to purchase varied stuff and I can zap and be zapped here on Nostr, no problem.
I do have one channel open only, so Alby Hub indicates "46% node health". The channel is under 10% of its total capacity, though, so I don't think I really need to open another one. Do you think that's the problem?
Sorry nostr:npub1v3tgrwwsv7c6xckyhm5dmluc05jxd4yeqhpxew87chn0kua0tjzqc6yvjh, I was not clear. The issue is not payment failure. When the client waits for buyer invoice, it does not accept the invoice when it gets pasted from alby. So the channel capacity should not matter.
nostr:npub1s277u5rww60te98w9umz6p7pjcxuus96cegdsf4y978qcqvu8jtq88dsym do you remember if there was a particular error popping up?
No error message. I pasted the invoice, pushed the submit button, and nothing happened.