  We report on spectroscopic and time-domain measurements on a fixed-frequency
concentric transmon qubit in an applied in-plane magnetic field to explore its
limits of magnetic field compatibility. We demonstrate quantum coherence of the
qubit up to field values of $B={40}\,\mathrm{mT}$, even without an optimized
chip design or material combination of the qubit. The dephasing rate
$\Gamma_\varphi$ is shown to be not affected by the magnetic field in a broad
range of the qubit transition frequency. For the evolution of the qubit
transition frequency, we find the unintended second junction created in the
shadow angle evaporation process to be non-negligible and deduce an analytic
formula for the field-dependent qubit energies. We discuss the relevant
field-dependent loss channels, which can not be distinguished by our
measurements, inviting further theoretical and experimental investigation.
Using well-known and well-studied standard components of the superconducting
quantum architecture, we are able to reach a field regime relevant for quantum
sensing and hybrid applications of magnetic spins and spin systems.
