As advocates for out-and-proud queer visibility, they have been embraced but also criticized for behavior at odds with their message. Some fans were rattled when, in December, a photo surfaced of a young Mx. Hopkins beside a swastika drawn in sand at the beach. (Mx. Hopkins apologized publicly and said it was taken in 2011, “a time in my life where I thought being ‘politically incorrect’ was really funny and had literally no concept of my actions,” adding that it did not represent “who I am today.”)

After the print version of this article went to press, additional questions about Mx. Hopkins’s behavior began to circulate online, spurred by postings on social media accusing Mx. Hopkins of sexual misconduct and boundary-crossing behavior. “These allegations are shocking to us and we take them very seriously,” the band wrote in a statement that was posted to social media on Thursday, adding that they “are trying to address them with openness and accountability.” The band announced it would set up an email address through which allegations could be discussed and was seeking a mediator to monitor it.

Since the allegations, initially posted to a private Facebook group and later on Twitter by a user known as Kitty Cordero-Kolin, several companies and musicians affiliated with the band have ended their relationships. An album-release show at Rough Trade in Brooklyn was canceled, and several artists who were slated to support PWR BTTM on its coming United States tour announced they will no longer participate. The band was also dropped by its management agency, Salty Artist Management.

Polyvinyl, which put out “Pageant,” announced on Saturday it would no longer work with PWR BTTM, or sell or distribute its album, in hard copy and on streaming services. It will offer refunds to those who purchased “Pageant” from the label, and plans to make donations to two organizations that combat sexual and anti-LBGT violence.

The band declined to comment further.

Mx. Bruce and Mx. Hopkins met as students at Bard College in Annandale-on-Hudson, N.Y. Mx. Hopkins was escaping a small-town public school in South Hamilton, in eastern Massachusetts; Mx. Bruce attended a slightly more forgiving private school, Concord Academy, not far away. They arrived at Bard to find a campus far more open to the varieties of identity.