SLC Sell side unable to get onetime user and password

Dear SLC Experts,

We are implementing SLC for our one of the customer. Configuration completed and testing the SLC process.

Supplier registration completed as a supplier at sell side --> Approved as a Category Manager at Buy side --> Email notification triggered to supplier contact person about the link, User ID and Password at Sell side. (not working in my system).

Now, this is not happening and got strucked. I have the tested my email notifications using So01 and able to receive the mail from Sell side.

It would be great if you share your solution to proceed further.

Thanks & regards,

Kumar