The minimal non-supersymmetric $\mathrm{SO}(10)$ Grand Unified Theory consists of the scalar sector $\mathbf{45}\oplus\mathbf{126}\oplus\mathbf{10}_{\mathbb{C}}$. Since this model is expected to provide robust proton decay predictions, its analysis is of great interest, but has been hampered by tree-level tachyonic instabilities and thus requires an assessment at one-loop level. We describe in these proceedings the latest progress in such efforts. We find that viable regions of parameter space exist where the scalar spectrum is non-tachyonic, perturbative and compatible with unification. The latest developments show, however, an obstruction in the Yukawa sector: realistic fermion masses require the Standard Model Higgs doublet to be fine-tuned to the EW scale in such a way that it is an admixture of states from both the $\mathbf{10}$ and $\mathbf{126}$, which turns out to be in tension with either tachyonicity or perturbativity of the scalar spectrum. This strongly indicates the model is not perturbatively viable, albeit due to a subtle and perhaps unexpected reason.