Suspension of registration for discrepancies in GST returns triggers portal notice and a time-limited opportunity to respond before cancellation proceedings. Provision for suspension of registration under sub-rule (2A) of rule 21A allows immediate suspension where return comparisons or other analyses show significant discrepancies indicating contravention and a threat to revenue; suspension is accompanied by an electronic intimation/notice (to be delivered via portal dashboard in FORM GST REG-17 until FORM GST REG-31 functionality exists) inviting the registrant to explain within a prescribed reply period, after which the proper officer may revoke suspension by FORM GST REG-20 or cancel registration by FORM GST REG-19 following examination and verification.