We have an 8 user Office 365 Business Essentials subscription, as you can see from the snipping grab below the list of services that Skype is one of them.
After reading a couple of threads, I downloaded Skype for Business from this link which was in one of the threads. When I log in to the office.com and go to all apps Skype/Skype for Business is not listed at all.
Is this a new tenant, as in created after October 2018? If so, it would not come with Skype for Business (unless over 500 users) as Microsoft Teams is now the default chat, meeting and calling application. Tenants created before that time still have it but it’s being retired in July 2021 and Microsoft is busy moving all tenants sub 500 to Teams. As far as I can remember there is a backdoor workaround to light it up but would not recommend this.
Yes the subscription is post Oct 2018, so that explains it. I did see that SfB was being deprecated in favour of teams but not that it had been dropped for new subscribers. It is slightly misleading that the Icon for SfB is still shown on the 365 subscription panel.