why does QB online does not recognise the clients email address which were saved and worked properly for the last 12 months. Suddenly, the email is not correct.

Hello, Seby. Could you clarify where your client's email address is encountering issues? Is this email associated with the customer's profile or is it part of the company/user email in the Account and Settings? Providing this information will help us identify the root cause and provide the appropriate solution.

QuickBooks Online (QBO) sometimes fails to recognize email addresses due to formatting problems. To fix this, let's double-check the email by going to the Customer Hub under the All Apps menu. Select Customers, choose the affected client, then click Edit to check for any formatting mistakes in the email field.

If you’re referring to the company email, follow these steps to check it:

1. Go to the Gear icon and select Account and Settings.
2. Click on the Company tab.
3. Double-check the email address in the Email field.

If the email appears accurate, let's update it re-entering the saved email and pasting it into the Email field, or by changing the email address in either the Customer's profile or the Account and Settings, depending on where you're working. Please follow the steps mentioned above to update the client's email address and ensure to click Save to apply the changes.

Additionally, refresh your browser, then log out and sign back in to determine if the issue is browser-related and to verify that the client's email address functions correctly.

Please don't hesitate to reply if you have more questions. We're here to help.