This was a lot more difficult than I thought it would be.

Physical and Virtual Cards (all with low balance) that DID NOT WORK:

• PayPal Physical Debit Card (would have worked if balance was over a couple dollars)
• Virtual prepaid card issued by Tremendous.
• Virtual prepaid card issued by MyPrepaidCenter.
• One Financial debit card.
• CURRENT virtual debit card.
• CURRENT physical debit card.
• CHIME physical debit card.
• Revolut virtual debit card.
• Privacy.com virtual debit card.

Here’s what did work for a free trial of SEMRush:

• PayPal physical debit card with balance that was over $5.00.
• Physical debit card from a traditional bank.