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Hello,
Thank you for reaching out to Ledger Support and I’d be happy to assist you with your request.
Please note that your Metamask account is linked to a different recovery phrase and your Ledger account is linked to a different set of the recovery phrase. So it is not possible to add/merge your Metamask account in Ledger Live or secure your current Metamask account with a Ledger device.
I would suggest not to import your Metamsk recovery phrase in the Ledger device since the recovery phrase of Metamask is generated online and it may get exposed on the internet even after you delete your Metamask wallet resulting in loss of your assets.
In your case, I would recommend transferring all your assets from Metamask accounts to Ledger accounts so that your assets are secured by recovery phrase generated offline by your Ledger device.
Please make sure to unstake any assets before transferring from them to your Ledger account.
After you have transferred your asset to your Ledger ETH account, you can connect your Ledger device to Metamask to manage your account.
Instructions here: https://support.ledger.com/hc/en-us/articles/4404366864657-Set-up-and-use-MetaMask-to-access-your-Ledger-Ethereum-ETH-account?source=answerbot&auth_token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJhY2NvdW50X2lkIjoxNDMxNTQzLCJ1c2VyX2lkIjoxOTA0OTg4MjUxNzUzLCJ0aWNrZXRfaWQiOjExODAzODEsImRlZmxlY3Rpb25faWQiOjM2MDI4MDA1OTMzOCwiYXJ0aWNsZXMiOlszNjAwMjA4NzExNTcsNDQwNDM2Njg2NDY1Nyw0NDA4NTU4NTg2Mzg1XSwidG9rZW4iOm51bGwsImV4cCI6MTY0Mjc4NDM2Nn0.dm1CPp6G57pteu-4W1dpglGZLwfcdGmFdVdhf3m1f8Y&docs=true