When Apple blocked the Beeper Mini app final month from giving Android customers entry to the tech big’s messaging service, Beeper inspired clients to make use of their Mac computer systems as a substitute to attach and proceed sending messages.

However in current days, dozens of Beeper clients have reported that they not have entry to Apple’s messaging service on their Android telephones or their Mac computer systems. A number of have known as Apple’s buyer assist and been advised that the corporate had revoked their Mac’s entry to iMessage due to irregular exercise. None had been warned that they might be dropping the service.

For Beeper clients, a lot of whom want Android units to iPhones however favor Mac computer systems over PCs, Apple’s transfer reveals simply how far the corporate will go to take care of management over its companies. In these cases, Apple minimize off one of many companies that it supplied with its computer systems as a result of it had objected to the way in which its clients used it.

“Legally, they’re in all probability within the clear due to their phrases of service, however it’s nonetheless type of crappy,” mentioned Matvei Vevitsis, who seen this month that he may not ship his mom iMessages by way of his 12-inch MacBook.

Apple declined to remark. After The New York Instances contacted Apple, some Beeper clients started reporting that they’d been unblocked in current days.

The maneuver is the most recent in a tit-for-tat between Apple and Beeper that has gotten the eye of antitrust regulators. Final yr, the Justice Division met with Beeper’s management group about Apple’s actions, and the Federal Commerce Fee mentioned in a weblog that it will scrutinize “dominant” gamers that “use privateness and safety as a justification to disallow interoperability” between companies.

Beeper Mini debuted on Dec. 5 as an app that provided Android cellphone customers the power to ship encrypted messages to iPhones. It made it attainable for folks with Samsung and Google units to ship high-resolution movies and use perks like animations, which had beforehand been reserved for iPhone clients. Inside three days, the app had added 100,000 clients.

However Apple blocked the app by altering its iMessage system. It mentioned the app created safety and privateness dangers.

Beeper then got here up with an answer to take care of its service. It requested clients to make use of their Mac computer systems to get a license plate for iMessage and to make use of that to log into Beeper on an Android gadget.

Mr. Vevitsis, 31, mentioned he had used a MacBook from round 2015 to attach Beeper to Apple’s messaging service on his Samsung Galaxy cellphone. A self-proclaimed tech tinkerer, he prefers utilizing Android telephones as a result of the system is extra customizable than an iPhone. However his mom has an iPhone, and he wished to have the ability to ship her high-quality pictures and movies.

Early this yr, Beeper stopped working, and Mr. Vevitsis was not in a position to ship his mom messages. He opened his MacBook and tried to message her straight however had the identical downside, so he known as Apple assist.

“Apple advised me my iMessage had been flagged for spam,” he mentioned. The Apple assist consultant had provided to unblock him, however that didn’t resolve the issue. In the end, he downloaded an app that allowed him to create an alternate serial quantity for his MacBook and was in a position to start utilizing iMessages once more.

Beeper mentioned greater than two dozen of some 3,500 clients had reported related outages on their Macs. A number of of these clients spoke with The Instances and offered information and particulars of their conversations with Apple assist.

Ghazi Shami, the founding father of Empire, an impartial music firm in San Francisco, mentioned he had run into related hassle. Like Mr. Vevitsis, Mr. Shami prefers utilizing a Galaxy to an iPhone, however many musicians ship audio recordings with iMessage. Mr. Shami would hook up with Beeper utilizing his iMac Professional desktop in order that he may ship and obtain these recordings from his cellphone.

However late final yr, he mentioned, Beeper stopped working and iMessage shut down on his iMac, which Apple priced at $5,000 when it was launched in 2017.

“I don’t assume it’s within the spirit of Silicon Valley to dam somebody’s serial quantity as a result of they have been testing beta software program,” Mr. Shami mentioned. “It’s like they’re reprimanding schoolchildren.”