Venmo Payment Method?

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What I’m trying to do

I am just trying to buy Sync (monthly) with my Venmo debit card, and I get the following error message:
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obsidianvenmo

Things I have tried

I tried contacting Venmo, and they gave me a completely useless generic “we have no idea why this transaction declined, try again later???” reply.

You can try emailing [email protected] to see if they have more info.