The US, UK, and three other governments have called on tech companies to build backdoors into their encrypted products, so that law enforcement will always be able to obtain access. If companies don’t, the governments say they “may pursue technological, enforcement, legislative, or other measures” in order to get into locked devices and services.
Tech companies have (also) been wary to comply. Adding a backdoor into their products would inherently mean that their promise of data privacy is broken. It would also open them up to similar requests from other countries, which could use the backdoor access for spying in inappropriate circumstances.