If you cannot sign in
Do not create a duplicate account simply because the old email is unavailable. Contact the database provider and explain that you need to recover or update the existing record.
PetChipHelp is an independent guidance service. We can help identify the database and explain the process, but official microchip records are changed by the database provider that holds the registration.
Have the microchip number?
Check which database appears to hold the record, then go straight to the right provider.