@ind82, Welcome to the HP Support Community!
No, you cannot use Instant Ink cartridges in Sri Lanka. It can only be used in the US or the country it was bought in. There is no Instant Ink service available in Sri Lanka as of yet.
This printer uses HP 67 ink cartridges in the Asia region.
If you have this set of ink cartridges and the printer with you, we can try to perform a region reset.
Without the printer or the printer driver installed on the computer, we cannot perform the reset.
To buy the compatible ink cartridges, you may visit Hp Store or buy them from a local store nearby.
Hope this helps! Keep me posted.
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KUMAR0307
I am an HP Employee