I was surprised that it is not in the database. The Journal is:
Islamochristiana
ISSN: 0392-7288
Pontificio Istituto di Studi Arabi e D'Islamistica (PISAI), Rome, Italy.
It publishes one volume every year and is quite well-known among the experts.
The volume 49 (2023) has 507 pages + 60 pages in Arabic.
Please note that you wrote to the ResearchGate community, not to the RG support team. You will find the link to contact the team at the buttom of each page ("Contact us"). However, in this case it is useless to contact them. See https://help.researchgate.net/hc/en-us/articles/14293139566353-Journals for explanations why some journals are missing. Unfortunately, it is not possible to add a journal to RG's database manually. In case of a missing journal in this database, I add the bibliographic data to the abstract field (like, e.g., in https://www.researchgate.net/publication/344474227 and https://www.researchgate.net/publication/268925009).
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