A digital letter of approval (DLOA) is used by a subscription manager (SM) server to determine whether a device is compliant with requirements for an application to be provisioned. If the device is compliant, the application is provisioned to the device or to an embedded universal integrated circuit card (eUICC) included in the device. To increase the security of the device DLOA, the device DLOA is linked to the eUICC, in some embodiments. The linkage may be based on one or more platform label fields in the device DLOA. A database is consulted, in some embodiments, to confirm a relationship between the device and the eUICC identified in the device DLOA. In some embodiments, the eUICC signs the device DLOA and the device DLOA with eUICC signature is sent to the SM server. In some embodiments, the device provides a device signature on the DLOA independent of the eUICC.