E-invoicing setup not completed in Zoho Books

E-invoicing setup not completed in Zoho Books

My status on the EmaraTax portal appears as linked with Zoho. However, when I try to complete the setup on the E-invoicing tab in Zoho Books settings, I receive an error saying:
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"E-Invoicing could not be enabled as the FTA portal is currently unreachable. Try again in a few minutes."
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I registered on the EmaraTax on 8th October and so far, the portal has not been reachable. Is anyone else facing the same issue? How to solve it