The adoption of digital signatures is becoming increasingly popular among Malaysian users due to its many advantages, including increased security, convenience, and cost savings. However, one of the challenges that users face is the lack of cross Certification Authority (CA) interoperability, which hinders the ability to use digital signatures across different platforms and services. To address this challenge, there is a growing need for promoting cross CA interoperability in Malaysia, which would enable users to use digital signatures seamlessly across various platforms and services. This paper aims to identify the CA capacity and digital signature market demand in promoting cross CA interoperability. This can be achieved through the qualitative interviews from CAs operating in Malaysia to gather views on interoperability across their platforms, the value and implications of such practice, and to establish the potential relationship between interoperability and increased Digital Signature efficiency and market demand. The interview data is analyzed using Atlas.ti and meta-analysis. Based on the result, the adoption of digital signatures and the promotion of cross CA interoperability are critical for advancing Malaysia's digital economy and enhancing the country’s overall competitiveness. With the right infrastructure and policies in place, Malaysia can become a leader in the use of digital signatures and the promotion of cross CA interoperability, which would benefit both individuals and businesses alike.