Installing problems with Conda, micromamba on a Mac OS15.x

Has anyone else had problems install into an environment on Mac OS 15.x–Sequoia??
On two identical Mac with M3 chips, micromamba installation of BUSCO only works with OS 14.x and will not install BUSCO on OS 15.x.
One of many errors looks like:
error libmamba Could not solve for environment specs
The following packages are incompatible
└─ busco is not installable because there are no viable options
├─ busco 3.0.2 would require
│ └─ blast >=2.2,<2.4, which does not exist (perhaps a missing channel);

The important point: is that micromamba work well on the identical Mac running 14.x but not on Sequoia OS 15.x.

Has anyones else had this problem?