Hi there, Dean. Are your customers receiving specific error codes, or is the expiry field simply refusing input? Determining if this affects all users or just a few is essential, as isolated cases often stem from specific account settings.
First, ensure your payment account is active and linked under Settings > Account and Settings > Payments. Within the Sales section of your Account and Settings, also verify that the options to accept online payments by Accept cards and Pay by Bank are toggled on.

Since these changes only apply to future invoices, you must also open the specific invoice in question and ensure the Cards and Pay by Bank options are toggled on under the Payment options section.

If the settings are correct but the problem is widespread, toggle these options off and back on to refresh the connection.
If the issue persists, please contact our Live Support Team so they can investigate your account connection further. To reach them, click the Help (?) icon, go to the Search tab, and select Contact Us. You’ll see options for live chat or a callback. For details on when support is available, check our Support Hours guide.
Feel free to reach out if you have any other concerns or additional questions.