I am unable to connect my Tide card with my Google Ads account?

Google often does not allow you to connect your Tide card details as your Google account payment method mentioning that it does not allow pre-paid cards.

When adding your Tide bank account as your payment method for your Google Ads account, you will need to make sure you add the payment method with your Tide bank account details instead of the Tide card details.

This means that you should choose the option to connect a bank account instead of a card so you can enter your sort code and account number and the payments can be made via bank transfer. 

If this is not connecting either for you, another way to connect your bank account is through PayPal. You can apply for a PayPal Debit card that is linked to your bank account. Then you will be able to add your PayPal Debit card details as your payment method and the funds will be drawn from your bank account.

Also, you can input another payment method such as a business credit card.