sorry for the n00b question, it's been awhile since I looked into this. I have a Bitcoin Core wallet on my machine with a backup of the wallet.dat. It's been ages since I opened the application, so I've upgraded it and am re-syncing it.
I also have a Blockhain.com account (originally opened when it was Blockchain.info). I remember that on Blockchain.com I could see my BTC amount. I now can't log into to Blockchain.com because my 2FA device changed and support hasn't gotten back to me for days about how to reset it. Googling suggests their support never gets back.
Since I'm not hearing back from support I'm wondering if I have lost control of my wallet funds. Did the action of creating a Blockchain.com/Blockchain.info account mean I have handed over my wallet to the company and lost this BTC?