A google search (see Maxim 6) for sas WARNING: LSMEAN differences for Days are not estimable; no table of differences will be produced. lead me to these results:
https://communities.sas.com/t5/Statistical-Procedures/Why-am-I-getting-quot-non-est-quot-in-an-lsmeans-tables/td-p/79466
https://support.sas.com/kb/22/582.html
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