Not sure what 24/7 here means but here are the support hours on Sunday or one day before the gates open:

How to contact ProConnect Tax

for help

All support channels are operational.

What are you looking for? Contact Hours

Trending topics	Hot topics for ProConnect	24/7
Find help answers, request a phone callback, or chat with support	Digital Assistant	Assistant is available 24/7 but callbacks and chats are available during operating hours below.
Support & Renewals: For customer service and technical support, and to renew ProConnect Tax		Monday - Friday, 6:00 am - 5:00 pm (PT)
Talk to our agents to discuss purchase options in more detail. To purchase ProConnect, click Buy now or visit our our website to learn more.		Monday - Friday, 6:00 am - 3:00 pm (PT) (Extended hours for Tax season)

*All hours listed are in Pacific Time and all hours are subject to change without notice.