Short answer
If your registered agent resigns, you generally have a limited window to appoint a replacement before the state acts. The agent typically notifies both you and the state, and the state expects a new agent on file promptly. Leaving the position vacant can put the entity out of good standing and, if it drags on, lead to administrative dissolution. Appointing a new agent quickly keeps the company compliant.
A registered agent can step down, and when that happens the agent usually files a resignation with the state and notifies the company. States do not allow a business to operate with no agent on record, so there is a period, which varies by state, to name a replacement. During that gap, legal notices and state mail may have nowhere reliable to go, which is exactly the risk the requirement is meant to prevent.
The fix is to appoint a new registered agent and update the state record before the deadline passes. Owners who used an individual agent who resigned often switch to a Commercial registered agent at this point for continuity, so a future resignation or address change does not create the same scramble. Acting quickly avoids penalties, loss of Good standing, and the more serious path toward Administrative dissolution.
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