The Thai army said on Monday it will ban its 245,000 members from using one of Southeast Asia's biggest e-commerce websites for official purposes after royalists said a promotional video appeared to mock the royal family.

Thailand has strict lese majeste laws and courts can hand down jail terms of up to 15 years for each offence of defaming, insulting or threatening King Maha Vajiralongkorn, the queen, heir or regent...