Microsoftmoez1975 , let start from the scratch. Office/Microsoft 365 is only means you are on subscription model. Next to know is on which platform you are - Windows Desktop or iPad, Excel Online or on Android, etc. Next on which subscription you are - consumer (Home, Personal) or Business / Enterprise (e.g. E3). Next on which channel you are, they are from Beta for insiders with most frequently feature update to semi-annual one where functionality is updated twice per year. Next which version within the channel, it could be only one per channel or few, for semi-annual there are 3 versions. Finally is build number.
Within subscription you may shift from one channel to another free of charge, that depends only on your own or your organization preferences. How to shift on Beta channel is here https://insider.office.com, depends you are on consumer or business subscription.
Please note, on subscription model functionality is deployed gradually, that means not all people on channel and on same platform and having same build receive new functionality at once. If some feature is announced for some build number, it doesn't mean you have it on this build, that only means that the code for this functionality is included into the build. If you don't have some, that's only wait for a while Microsoft shift the key. It's not necessary to update, it could happen that you have no feature, take cup of coffee on smoke break, return back to computer and functionality appears. The only computer shall be connected to internet, licensing manager recognizes that you are included into the deployment pool and make this functionality available for you. I simplify a bit, but that approximately how it works.
On Beta channel usually new functionality is available first for random 20% or 50% of subscribers, and in some while, from few weeks to few months, all Beta channels subscribers have it. Don't ask me why so.
As for LAMBDA, it shall be available now for all Beta subscribers.
