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Hi @jlsheridan1
Welcome to the Community!
If you've been locked out from your modem/router interface, then the only way to fix it is by resetting the modem/router to its default settings.
You need to set up the modem/router manually once done. We've created an article that will guide you on How to set up your TP-Link VR1600v modem.
Stay safe,
BasilDV