You must have a Washington State managing broker license to qualify for a branch manager endorsement.
Your branch manager endorsement appears on your managing broker license. The endorsement expires with your license 2 years after it's issued.
Your branch manager endorsement renews automatically when you renew your managing broker license. See How to renew your license: Real estate brokers and managing brokers to learn how to renew.
This must be done online by the firm's designated broker. See Update your license: Real estate firms.