Wipro — Resume No[protected] Background verification error

I have been selected in the WILP 21 program and accepted LOI a month ago. But whenever I try to open the portal for the submission of documents, a error always occurs and shows the page can't be found. It's almost 1 month and the same issue is occurring.
I have tried contacting the wipro manager, but there is still no solution regarding this.
I will be really helpful if an adequate solution can be provided to me ASAP.
My resume number is: 20826787