The tribunal said the U.S. company concealed information when it sought approval in 2019.
ONDC is a non-profit company whose network will enable the display of products and services from all participating e-commerce platforms in search results across all apps on the network.
Late last month India soft-launched its Open Network for Digital Commerce (ONDC) as the government tries to end the dominance of US companies Amazon.com and Walmart in the fast-growing e-commerce market.
Indian retailers, key supporters of PM Modi, have long contended that Amazon and Flipkart's platforms benefit a few big sellers, via predatory pricing, though the companies say they comply with all Indian laws.
The union is the personal project of one Christian Smalls, fired from the Staten Island site for organising a walkout. For two years, work has been afoot on unionising one of the citadels of modern capitalism.
Future Retail said on February 26 it was "scaling down its operations" to cut losses although it made no mention of Reliance in its statement.
Amazon's rivalry in India with oil-to-retail conglomerate Reliance Industries looks set to head to the cricket field.
Credit card fees have been a growing source of tension between Amazon and Visa.
The vessel, known as Y721 during construction, will measure 127 metres (139 yards), making it the largest sailing yacht in the world when it launches in 2022.
Employees at the retailer's warehouses were paid to share positive impressions about the company and to deny widely-reported workplace failings, the report mentioned.