Definitely a scam.
1. ATO/Medicare and I would expect Social Security all deposit tax refunds, medical rebates and social security pensions directly to your bank account providing you have a nominated bank account registered in MyGov. You don't have to do anything in MyGov except provide the bank account details.
2. You can log into MyGov independently and directly, not via the link they sent you and check if the account is there.
3. You should know if there is a refund owning after doing your taxes.
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