It’s a challenging time to be @Liztruss on Twitter.

The appointment of Liz Truss as Britain’s prime minister has brought a flood of new attention to the Twitter account of @Liztruss.

Ms. Truss and her team share updates under the verified username @trussliz. But that has not stopped some international leaders, British lawmakers and everyday Twitter users from mistakenly sending their well wishes — or ill wishes — to the other account. That has belonged since 2009 to another user, apparently named Liz Trussell, who has taken the case of mistaken identity with good humor.

On Monday night, after the prime minister of Sweden, Magdalena Andersson, mistakenly congratulated @liztruss on her new role, she responded: “Looking forward to a visit soon! Get the Meatballs ready.” (Ms. Andersson deleted and reposted the tweet tagging the intended Liz Truss.)

“Thanks Hun,” she wrote to one well-wisher congratulating her. “Sorry I was in Nandos,” she responded to another user.

A request to @Liztruss for an interview was not immediately returned.

The cheerful, tongue-in-cheek responses — complete with emojis — offered some levity during a political transition that comes amid a worsening economic crisis.

Some quipped that the person behind @Liztruss could herself have been a contender for prime minister. “Frankly she’d probably make a better job of it,” said Caroline Lucas, a Green Party lawmaker who apologized for erroneously tagging @Liztruss in a tweet in which she called the incoming prime minister a “right wing ideologue.”

Others joked that if the owner of the @Liztruss account traveled to Balmoral before Ms. Truss, surely Queen Elizabeth II would have no choice but to name her Britain’s new leader?

“I’m on my way,” she responded. “Me & Queen Liz would deffo be besties.”