You need to accept the invitation from your client to set up the vendor connect.
Log in to your Back Office application
Click the ‘Add-ons’ menu group of the main menu.
On the ‘Add-ons’ page, turn on the ‘Vendor Connect for Vendor’ feature and wait until the feature status becomes ‘ON’.
Click the ‘Vendor Connect’ option in the ‘Settings’ menu group of the main menu.
On the ‘Clients’ tab of the ‘Vendor Connect’ page, click the ‘Accept Invitation’ button
In the ‘Accept Invitation’ view, enter the code from the ‘Vendor Connect Invitation’ email, and then click ‘Next Step’
Enter the appropriate settings and then click ‘Save’