GST migration window re-opening requires taxpayers to complete migration steps and coordinate with nodal officers by prescribed deadlines. Re-opening of the GST migration window provides a procedural timeline: taxpayers must submit specified details to the jurisdictional nodal officer; jurisdictional Deputy/Assistant Commissioners will verify and forward submissions to the zonal nodal officer; zonal nodal officers will transmit details to GSTN; and taxpayers must take required actions after receiving communications from GSTN. Trade associations are requested to circulate the notice to members to ensure completion of migration formalities within the extended timeframe.