Where do I get a tax certyficate of residence from Envato?

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This answer is not correct.
The certificate is issued by Australian Government/Australian Taxation Office, below is an excerpt and the link:

Australian Taxation Office
PO Box 3006
Penrith NSW 2740
Certificates of residency

A certificate of residency is a document supplied by us. It’s issued to Australian residents to prove to foreign tax authorities that you are an Australian resident for income tax purposes.

The link: https://www.ato.gov.au/individuals/international-tax-for-individuals/in-detail/residency/certificates-of-residency-or-status/#Certificatesofresidency