Can you help me why i can't accept the Invitation as an accountant?

Hi Mayar Ramadan,

Welcome to Community!  It's great to hear that your client is inviting you to their books, so you can accomplish your daily goals effortlessly.  QuickBooks Online makes it easy to add accountant users.  I'd be glad to help!

If you haven't done so already, I suggest clearing cache on your browser.  This will help to improve system performance and web page loading times.  Then proceed to your email and right click on the invitation link, sent by your client.  Open the link in a private or incognito window.  Proceed to sign in with the email address and password associated with your accounting firm.  If you're unable to accept the invitation, have your client delete it, then resend it to you.

Feel free to reach back out, if you have other questions or concerns.  We'd be happy to assist!