I've had the SAME success while using a recommended Acinq channel with 1M sats liquidity, mostly on my side. When I contacted support I've been told that I needed to keep experimenting with other providers like Megalith.

I call this liquidity censorship. I'm connected with a friend ( nostr:nprofile1qqs2uyqg6gunpdmkcxqf9ah2ks0ykz0u70cr7djpkx6wdm3659ndwcqpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtcppemhxue69uhkummn9ekx7mp0qythwumn8ghj7un9d3shjtnswf5k6ctv9ehx2ap0zfe8xc ) and I've NEVER had this issue at all and Lord knows I sent mega payments with the same channel size.