[3] During this time, they self-released their debut EP, Ambassadors, creating a music video for its lead single, "Tropisms", shot and directed by Rodrigo Zedillo.

[4] They launched a Kickstarter campaign to fund and shoot two music videos for the EP's singles, "Weight/Lightness" and "Unconsolable", with the latter being re-recorded later.

[13] In March 2015, X Ambassadors released the single "Renegades", which appeared on their debut album, "VHS", published on June 30, 2015, and featuring collaborations with Jamie N Commons and Imagine Dragons.

A special edition, titled VHS 2.0 was released on June 10, 2016, with five additional tracks and without the interludes that were included on the original version.

On June 20, 2016, X Ambassadors announced that Feldshuh would be taking an indefinite hiatus from the band to deal with personal issues.

[14] X Ambassadors released four standalone singles in 2017: "Hoping" in March, "Torches" in April, "The Devil You Know" in June, and "Ahead of Myself" in July.

Three months later, on April 19, 2019, over a year after the announcement of Joyful, the band stated they had cancelled it in favor of new material for a different record, to be titled Orion, which would include the previously released track "Boom".

[22] On August 23, 2019, the band released a politically charged standalone single called "Optimistic", which centers around gun violence in the United States.

Sam Harris stated that it was a collection of tracks the band wrote that didn't quite fit on their upcoming third studio album, but they loved the songs and wanted to put them out.

On January 14, 2021, X Ambassadors released a single called "ultraviolet.tragedies", a heavily rap-focused song featuring Terrell Hines.

Sam Harris said that with this project, he wanted to "give a voice to (several) incredible artists that people may not have heard yet, and really let their imagination be at the forefront of everything".

On June 11, 2021, the band put out a song titled "My Own Monster", which was also announced to be the lead single from their third studio album, The Beautiful Liar.

[28] The Beautiful Liar is a concept album that plays out similarly to a radio drama, expressing themes of insanity, powerlessness, self-doubt, and anxiety.

On December 9, 2022, the band collaborated with Belgian DJ Lost Frequencies and singer Elley Duhé on "Back to You".

Sam Harris has stated that all of the members grew up listening to hip hop and R&B, but they also appreciated rock music, specifically alternative and indie groups.

[50] While writing their second album, he cited soul influences, including Ray Charles, Joe Cocker, Otis Redding, and the Band.

In March 2017, X Ambassadors performed a special show to benefit Planned Parenthood on International Women's Day.

[59] In June 2017, X Ambassadors announced that they would donate all the proceeds from their Mississippi Coast Coliseum Show to Unity Mississippi—an LGBT charitable organization,[citation needed] following the announcement that the state of Mississippi signed HB 1523 – the "Protecting Freedom of Conscience from Government Discrimination Act" into law.