What to do if the authorized director is unable to sign the document in Thailand?

Panwa: Can do 2 things: First, able to sign certified documents at the Thai embassy. Second, able to have a lawyer who has a license to certify notary public documents.

For more information, please feel free to contact us:

Office: +66 2 933 9000
Whats'App: +66 8 5713 1000
Email: bkk@panwa.co.th

Location: https://goo.gl/maps/MhJsbjkPrji51Qyt6
Sky train: Yellow Line, Chokchai 4 Station, Gate 4. Our office is located between Soi Latphrao 50 and 52.

Address: 1560 Latphrao Road, Wangthonglang, Bangkok 10310, Thailand.