In this workers’ compensation case, employer seeks judicial review of a Workers’ Compensation Board order that held the claim compensable. Employer argues that, because he never received a copy of the request for Board review of the administrative law judge’s (AU) opinion and order, the request for review was not timely filed, the AU’s opinion became final, and the Board lacked jurisdiction to review such a final order. We review for substantial evidence and for errors of law, ORS 183.482(8)(a), (c), and reverse and remand for reconsideration.

The material facts are undisputed. In 1997, claimant, a truck driver for employer, was diagnosed with a left leg deep vein thrombosis. Because employer was considered a noncomplying employer, the claim was forwarded to SAIF, which denied the claim.1 Claimant requested a hearing. The hearing was set for January 29,1998, and notice was mailed to employer at 19855 South Highway 97, Klamath Falls, Oregon 97603.

At hearing, claimant, acting pro se, was present. Pomeroy, an attorney acting in the capacity of a special assistant attorney general,2 appeared by phone. Pomeroy expressly stated that he was acting in the capacity of a special assistant attorney general and was not representing SAIF or employer. Employer did not appear. The AU upheld SAIF’s denial. Claimant requested Board review of the AU’s order. The request for review indicated that a copy was sent to employer but did not state to what address. The Board acknowledged claimant’s request for review and mailed a copy of the notice to employer. However, the notices of review and briefing were mailed to employer at the incorrect address of 5280 Wicket Court, Klamath Falls, Oregon 97603. *496Employer never filed a Board brief. The Board reversed the ALJ’s order and held claimant’s injury to be compensable.3 The order on review was also sent to employer at the Wicket Court address. The record does not suggest that either the notice of acknowledgment of the request for Board review, the notice of briefing, or the order on review mailed to employer was returned as undeliverable. Employer’s address was at all times 19855 South Highway 97. At no time did employer notify the Board that his address had changed.

In January 2000, the state, through the Department of Revenue, attempted to collect from employer the money paid out to claimant. That was the first time employer learned of claimant’s request for review of the ALJ’s order. Employer contacted DCBS, and for the first time in February 2000 received a copy of the Board’s order. In March 2000, employer sent a letter to the Board stating that SAIF’s denial was correct and that the Board erred when it reversed the ALJ’s decision. The Board acknowledged the letter and the fact that its order was sent to employer at the wrong address. The Board then issued an order republishing the order on review, addressing the compensability of claimant’s injury claim. The Board then republished its earlier order that determined the claimant’s injury claim was compensable. Employer seeks review of that order.

Under ORS 656.295(2),4 all parties must be served or receive notice of a request for Board review.5 See Mosley v. Sacred Heart Hospital, 113 Or App 234, 237, 831 P2d 721 (1992). “The request must be served on all parties within 30 days after the date on which the [ALJ’s] order is mailed. See *497ORS 656.289(3).” Kelsey v. Drushella-Klohk, 128 Or App 53, 57, 874 P2d 1349 (1994). Thus, unless notice of the request for review is mailed or actual notice is received within the statutory period, dismissal is required. Argonaut Insurance v. King, 63 Or App 847, 666 P2d 865 (1983).

Here, the Board did not address employer’s argument that claimant did not timely mail the request for Board review to employer and that employer did not receive actual notice of it. The Board also failed to make findings on the jurisdictional issue. Because “the Board must provide a ‘sufficient explanation to allow a reviewing court to examine the agency’s action!,]’ ” SAIF v. January, 166 Or App 620, 626, 998 P2d 1286 (2000), quoting Schoch v. Leupold & Stevens, 325 Or 112, 118, 934 P2d 410 (1997), we reverse and remand to the Board to explain why it rejected employer’s jurisdictional argument.6

Reversed and remanded for reconsideration.