Stakepool is listed as "Missing" on adapools (Daedelus View)

Staking & Delegation Setup a Stake Pool
9

So - since I had the same issue recently I just went through again checking the pool registration in the SMASH server - Daedalus is fetching the info from there.
And at least there is an error now:

curl "https://smash.cardano-mainnet.iohk.io/api/v1/errors/77bacb7cb880adb3174299f0940dd2a0380beb376ee412e650172f94"

[{"time":"09.04.2021. 18:02:20","retryCount":1,"poolHash":"34082a7853367db1937b897cd853d23413287a2e544bad617f0ea7d125727036","cause":"URL parse error from poolId '77bacb7cb880adb3174299f0940dd2a0380beb376ee412e650172f94' when fetching metadata from 'ynms.io/poolMetaData.json' resulted in : ynms.io/poolMetaData.json","poolId":"77bacb7cb880adb3174299f0940dd2a0380beb376ee412e650172f94","utcTime":"1617991340.649667s"}]

Also there is another query for getting the registered metadata - which in your case it is empty:
wget https://smash.cardano-mainnet.iohk.io/api/v1/metadata/77bacb7cb880adb3174299f0940dd2a0380beb376ee412e650172f94/b379431caa21a3c1fba54a161a5a749c926c00a3827d9187edfcaa805bf69133

--2021-04-16 11:57:23--  https://smash.cardano-mainnet.iohk.io/api/v1/metadata/77bacb7cb880adb3174299f0940dd2a0380beb376ee412e650172f94/b379431caa21a3c1fba54a161a5a749c926c00a3827d9187edfcaa805bf69133
Resolving smash.cardano-mainnet.iohk.io (smash.cardano-mainnet.iohk.io)... 18.158.166.36
Connecting to smash.cardano-mainnet.iohk.io (smash.cardano-mainnet.iohk.io)|18.158.166.36|:443... connected.
HTTP request sent, awaiting response... 404 Not Found
2021-04-16 11:57:23 ERROR 404: Not Found.

So just checked the ledger state on blockchain and there you have - the URL of the metadata is wong - https:// prefix is is missing

 "77bacb7cb880adb3174299f0940dd2a0380beb376ee412e650172f94": {
                        "publicKey": "77bacb7cb880adb3174299f0940dd2a0380beb376ee412e650172f94",
                        "cost": 345000000,
                        "metadata": {
                            "hash": "34082a7853367db1937b897cd853d23413287a2e544bad617f0ea7d125727036",
                            "url": "ynms.io/poolMetaData.json"
                        },
                        "owners": [
                            "3b80a5f6cde5f69ae40f314247c26eb8442601e1cbc4aed44e27bd7b"
                        ],
                        "vrf": "884cc813871b33d7dbb8832a4117a77bd2ceb9015bc4a485c8fdca44ed6b7c9f",
                        "pledge": 1255555555,
                        "margin": 2.0e-2,
                        "rewardAccount": {
                            "network": "Mainnet",
                            "credential": {
                                "key hash": "3b80a5f6cde5f69ae40f314247c26eb8442601e1cbc4aed44e27bd7b"
                            }
                        },
                        "relays": [
                            {
                                "single host name": {
--
                            "key hash": "3b8066c8915889ca058ec3da4f7b833bc8d0bd69021897867be69035"
                        },
                        "7f6c103302f96390d478a170fe80938b76fccd8a23490e3b6ddebcf7"
                    ],

so re-register your node with corrected metadata URL: https://ynms.io/poolMetaData.json
Hope that was the issue!

How to debug smash server: